The management of PencilsRUs has determined that the daily Fixed Cost incurred in producing pencil packs is $125. Management has also determined that the daily Marginal Cost function associated with producing pencil packs is C' (x) = 0.000006x^2 - 0.006x + 4, where C' (x) is measured in dollars per unit and x is the number of units produced. (A "unit" is a "pencil pack.") Pete is interested in the area between the graph of C' (x) and the x-axis, which can be expressed as S(C' (x)) da. What does this area represent? the Marginal Cost, in dollars per unit the Fixed Cost, in dollars the number of units produced O the Total Cost, in dollars